diff --git a/firmware/storage.c b/firmware/storage.c
index a3e2f84..d5f5bc9 100644
--- a/firmware/storage.c
+++ b/firmware/storage.c
@@ -39,6 +39,7 @@
 #include "protect.h"
 #include "layout2.h"
 
+_Static_assert(sizeof(Storage) <= FLASH_STORAGE_LEN, "Storage struct is too large for TREZOR flash");
 Storage storage;
 
 uint8_t storage_uuid[12];